<template>
  <el-container class="home-container">
      <!-- 头部区域 -->
    <el-header>
        <div>
            <img src="../assets/logo.png" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout"> 退出 </el-button> 
    </el-header>
    <el-container>
        <!-- 页面主体区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区 -->
          <el-menu background-color="#333744" text-color="#fff" active-text-color="#ffd04b" 
          :unique-opened="true" :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
            <!-- 一级菜单 -->
            <el-submenu :index="item.id + '' "  v-for="item in menulist" :key="item.id">
                <template slot="title">
                   <i :class="iconObj[item.id]"></i>
                   <span>{{item.authName}}</span>
                </template>
                 <!-- 二级菜单 -->
                <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
                :key="subItem.id" @click="saveNavState('/' + subItem.path)" > 
                   <template slot="title">
                        <i class="el-icon-menu"></i>
                        <span>{{subItem.authName}}</span>
                   </template>
                </el-menu-item>
                
            </el-submenu>
          </el-menu>
      </el-aside>
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>

      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  data(){
     return{
         menulist:[],
         iconObj:{
             '125':'iconfont icon-users',
             '103':'iconfont icon-tijikongjian',
             '101':'iconfont icon-shangpin',
             '102':'iconfont icon-danju',
             '145':'iconfont icon-baobiao'

         },
         //是否折叠
         isCollapse: false,
         //被激活的链接地址
         activePath:''

     }
  },
  created(){
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    //获取所有的菜单
    async getMenuList(){
       const {data: res} = await this.$http.get('menus');
       //console.log(res);
       if(res.meta.status !== 200) return this.$message.erro(res.meta.msg)
       this.menulist = res.data;
    },
    //点击按钮，菜单的折叠与展开
    toggleCollapse(){
        this.isCollapse = !this.isCollapse;

    },
    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath;//该语句用于更新activePath，在点击二级菜单时不需要刷新就可高亮
    }
  },
    
};
</script>

<style lang = "less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 5px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  img {
    height: 50px;
    width: 50px;
    margin-top: 3px;
  }
  > div {
    display: flex;
    align-items: center;
  }
  span {
    margin-left: 15px;
  }
}

.el-aside {
  background-color: #333744;
  .el-menu{
      border-right: none;
  }
}

.el-main {
  background-color: rgb(226, 223, 223);
}

.iconfont{
    margin-right: 10px;
}

.toggle-button{
    background-color: rgb(44, 43, 43);
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;

}
</style>